Hello sorry to bother I don't know if I'm missing something or what but i have just this mod and the base mod of Factorissimo2 installed and I'm not seeing the scenario for this mod.
I had already clicked the install button on that in the install mods list and it added Factorissiom 2 Playthrough to the manage list and the base but even with that I'm not seeing the scenario unless that is something else.
Hold on so I launched a sandbox and it put me in the warehouse so i guess the mod just changes normal map setup I thought it was a scenario or something sorry
This mod is not a scenario. You create a new map as you would a normal Factorio game, and ideally, you would want to choose the map preset provided by the mod.